Issue 37, 2024

Unraveling electrochemo-mechanical aspects of core–shell composite cathode for sulfide based all-solid-state batteries

Abstract

All-solid-state lithium batteries (ASSLBs) are emerging as promising next-generation batteries for electric vehicles owing to their high energy densities and safety features. However, challenges such as inadequate material percolation and low cathode utilization often hinder their potential. This paper presents a core–shell approach to optimize the cathode active material (CAM) utilization. The resultant CAM composite showed high ionic conductivity, a highly dense microstructure with <10% porosity, and minimal stack pressure changes during electrochemical cycling. The maximum CAM utilization was achieved while effectively mitigating electrochemo-mechanical side reactions by applying a uniformly coated Li6PS5Cl solid electrolyte layer (≈500 nm) and a LiNbO3 buffer layer (≈10 nm) onto LiNi0.8Mn0.1Co0.1O2 particles (LPSCl@LNO@NMC). The engineered LPSCl@LNO@NMC composites, which incorporated a 5 wt% LPSCl coating on LNO@NMC powders, exhibited a dense microstructure that enhanced the mechanical stability at the cathode. Sulfide-based solid electrolyte (SSE)/SSE contact provided better ionic pathways within the composite and increased CAM utilization. Thus, an enhanced reversible capacity (197 mA h g−1) and exceptional high-rate cycling performance (86.3% capacity retention after 1000 cycles at 2C) were observed. These findings pave the way for the advancement and commercialization of high-performance ASSLBs.

Graphical abstract: Unraveling electrochemo-mechanical aspects of core–shell composite cathode for sulfide based all-solid-state batteries

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Article information

Article type
Paper
Submitted
12 Jun 2024
Accepted
02 Sep 2024
First published
06 Sep 2024
This article is Open Access
Creative Commons BY-NC license

J. Mater. Chem. A, 2024,12, 24896-24905

Unraveling electrochemo-mechanical aspects of core–shell composite cathode for sulfide based all-solid-state batteries

S. C. Han, M. Ali, Y. J. Kim, J. Park, Y. Lee, J. Park, H. Park, G. Park, E. Lee, B. G. Kim and Y. Ha, J. Mater. Chem. A, 2024, 12, 24896 DOI: 10.1039/D4TA04063E

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